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<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
</head>
<body>
  <script>
    var pi = Math.PI;
    function getCircumference(l) {
      return 2*pi*l;
    }
    function getArea(l) {
      return pi*l*l;
    }
    console.log(getCircumference(1));
    console.log(getArea(1));
  </script>
</body>
</html>